Partial Immersion Thermometer Views
Be aware that total immersion thermometers are generally more accurate than partial immersion thermometers of similar range and design. Partial immersion thermometers will show variances in temperature due to emergent stem temperature differences. Therefore, whenever possible, one should choose a total immersion thermometer. If the bath is too shallow or total immersion is otherwise impractical, emergent stem temperature corrections should be known and measured to reduce variances in repeatability.
All ASTM and other glass laboratory thermometers can be classified into 2 general groups - those designed and fabricated for total immersion and those designed and fabricated for partial immersion. If you use glass thermometers, it is essential that you understand the difference, and how each type of thermometer is used.
The immersion line is a quick and easy visual indication to the user. The thermometer should be immersed to this line for correct temperature indication. The reverse of the thermometer should have the inscription r"76MM IMMa" (or as appropriate). Partial immersion thermometers are usually easy to identify.
Note: some partial immersion thermometers do not have an immersion line inscribed; ie, thermometers with standard taper joints, or thermometers with very short immersions, such as for melting point applications. Pay special heed to the inscription on these thermometers, and immerse them as specified for the most accurate readings.
Partial Immersion Thermometer Images
